Cops are investigating a third slashing yesterday in a Bronx neighborhood where two women, including a Sunday-school teacher, were viciously attacked by a boxcutter-wielding thug over the weekend.

In the latest attack, a 23-year-old man was slashed across his wrist after he refused a demand for cash from a man in a ski mask, cops said.

Anthony Awardo was walking on Bristow Street in the West Farms section at about 6 a.m. when he was approached by the thug, who ran off after lashing out with his blade. Awardo was treated at a hospital and released.

Detectives are trying to determine if the latest attack is linked to the two Sunday slashings.

Meanwhile, the earlier victims are having nightmares and say they cannot rest until their attacker is caught.

Elida Quezada, 65, received over 100 stitches across her face after the madman attacked her as she walked to Bible class at a church on Longwood Avenue.

Quezada’s friend Acsenet Marrero said the grandmother is scared to go home knowing her attacker is free.

“She’s traumatized,” said Marrero. “She cannot sleep, every time she tries to go to sleep it flashes in her mind.”

Marrero was slashed only 15 minutes after 16-year-old Angelique Melendez was assaulted a few blocks away.

“I can’t be by myself,” said Melendez, who can only move two fingers on her right hand after being viciously punched and sliced. “I fell asleep and had a dream about the guy, all I saw was him trying to hit me, as soon as I woke up I started crying.”